1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11
12 // constexpr iterator(iterator<!Const> i)
13 // requires Const &&
14 // convertible_to<iterator_t<V>, OuterIter> &&
15 // convertible_to<iterator_t<InnerRng>, InnerIter>;
16
17 #include <cassert>
18 #include <ranges>
19
20 #include "test_macros.h"
21 #include "../types.h"
22
23 using ConstCompatibleInner = BufferView<int*>;
24
25 using ConstIncompatibleInner = BufferView<forward_iterator<const int*>, forward_iterator<const int*>,
26 bidirectional_iterator<int*>, bidirectional_iterator<int*>>;
27
28 template <class Inner>
29 using ConstCompatibleOuter = BufferView<const Inner*, const Inner*, Inner*, Inner*>;
30
31 template <class Inner>
32 using ConstIncompatibleOuter = BufferView<forward_iterator<const Inner*>, forward_iterator<const Inner*>,
33 bidirectional_iterator<Inner*>, bidirectional_iterator<Inner*>>;
34
test()35 constexpr bool test() {
36 int buffer[4][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};
37 {
38 CopyableChild children[4] = {CopyableChild(buffer[0]), CopyableChild(buffer[1]), CopyableChild(buffer[2]),
39 CopyableChild(buffer[3])};
40 std::ranges::join_view jv(CopyableParent{children});
41 auto iter1 = jv.begin();
42 using iterator = decltype(iter1);
43 using const_iterator = decltype(std::as_const(jv).begin());
44 static_assert(!std::is_same_v<iterator, const_iterator>);
45 const_iterator iter2 = iter1;
46 assert(iter1 == iter2);
47
48 // We cannot create a non-const iterator from a const iterator.
49 static_assert(!std::constructible_from<iterator, const_iterator>);
50 }
51
52 // !convertible_to<inner_iterator, inner_const_iterator>>;
53 {
54 ConstIncompatibleInner inners[2] = {buffer[0], buffer[1]};
55 ConstCompatibleOuter<ConstIncompatibleInner> outer{inners};
56 std::ranges::join_view jv(outer);
57 using iterator = decltype(jv.begin());
58 using const_iterator = decltype(std::as_const(jv).begin());
59 static_assert(!std::is_same_v<iterator, const_iterator>);
60
61 static_assert(!std::constructible_from<const_iterator, iterator>);
62 static_assert(!std::constructible_from<iterator, const_iterator>);
63 }
64
65 // !convertible_to<outer_iterator, outer_const_iterator>>;
66 {
67 ConstCompatibleInner inners[2] = {buffer[0], buffer[1]};
68 ConstIncompatibleOuter<ConstCompatibleInner> outer{inners};
69 std::ranges::join_view jv(outer);
70 using iterator = decltype(jv.begin());
71 using const_iterator = decltype(std::as_const(jv).begin());
72 static_assert(!std::is_same_v<iterator, const_iterator>);
73
74 static_assert(!std::constructible_from<const_iterator, iterator>);
75 static_assert(!std::constructible_from<iterator, const_iterator>);
76 }
77
78 return true;
79 }
80
main(int,char **)81 int main(int, char**) {
82 test();
83 static_assert(test());
84
85 return 0;
86 }
87